Add UI switch for Call+short/Put+long, premium x0.95 sizing, option-first open, and K+/-points exits with fee-aware net PnL.
Co-authored-by: Cursor <cursoragent@cursor.com>
Server validate on preview/start, UI filters and recommend templates, plus usability/security audit doc.
Co-authored-by: Cursor <cursoragent@cursor.com>